How to judge whether type B silica gel needs to be replaced?

To judge whether type B silica gel needs to be replaced, you can start from the appearance, weight, performance and other aspects. The following are specific methods:

1. Observe the appearance

① Color change: If color-changing silica gel is used, when the color changes from blue to pink, or from orange to green, etc., it usually means that the silica gel has absorbed a lot of water and is close to saturation, and needs to be replaced. For example, the commonly used color-changing silica gel containing cobalt chloride, blue indicates dryness, and it needs to be replaced when it turns pink after absorbing moisture.

② Shape change: Normal type B silica gel is usually regular granular or blocky. If the silica gel is found to be broken or powdered, it may be that its structure has been destroyed and the adsorption performance has decreased, and it is necessary to consider replacing it.

③ Feel the weight: After absorbing water or other substances, the weight of type B silica gel will increase. If it feels significantly heavier than the new silica gel, it means that it may have absorbed more substances and its adsorption capacity may have weakened, so it is necessary to replace it.

2. Performance Evaluation

① Moisture absorption effect: Place type B silica gel in an environment that requires moisture protection. If the surrounding environment is still humid, such as water droplets and mold on the surface of the object, it means that the moisture absorption capacity of the silica gel is insufficient and needs to be replaced.

② Deodorization effect: When used for deodorization, if you can clearly smell the odor and exclude other sources of odor, it means that the ability of silica gel to absorb odor has decreased and cannot play an effective role, and it should be replaced.

In addition, even if type B silica gel has no obvious appearance changes and performance degradation, it is recommended to replace it regularly every 1-3 months according to the use environment and frequency from the perspective of safety and effect.